Connected: An Internet Encyclopedia
RFC 1122 - 3.2.3 Internet Group Management Protocol IGMP

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### 3.2.3 Internet Group Management Protocol IGMP

IGMP [IP:4] is a protocol used between hosts and gateways on a single network to establish hosts' membership in particular multicast groups. The gateways use this information, in conjunction with a multicast routing protocol, to support IP multicasting across the Internet.

At this time, implementation of IGMP is OPTIONAL; see Section 3.3.7 for more information. Without IGMP, a host can still participate in multicasting local to its connected networks.

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Connected: An Internet Encyclopedia
RFC 1122 - 3.2.3 Internet Group Management Protocol IGMP